Preparation method of moisture-absorbing and quick-drying chinlon

Abstract

The invention discloses a preparation method of moisture-absorbing and quick-drying chinlon. The preparation method comprises the following steps: preparing a phosphorus pentachloride solution with the concentration of 20-50mmol / L; preparing a polyethyleneimine solution with the concentration of 2 to 10 weight percent; immersing the original chinlon in a phosphorus pentachloride solution for activation reaction to obtain activated chinlon; the activated chinlon is immersed in a polyethyleneimine solution for a grafting reaction, and grafted chinlon is obtained; the grafted chinlon is taken out and dried, and the modified chinlon is obtained. A hydrophilic polymer network is formed on the modified chinlon treated through the steps, and rapid moisture absorption, efficient conduction and rapid evaporation of moisture can be achieved through the hydrophilic polymer network, so that the moisture absorption and quick drying effects are achieved, and the requirements of sports suits, summer commuting suits, underwear and other easy-to-sweat scenes are met; the problems of stickiness, stuffiness and the like caused by sweat retention can be avoided.

Description

Technical Field

[0001] This invention relates to the field of functional modification of textile materials, specifically to a method for preparing moisture-wicking and quick-drying nylon. Background Technology

[0002] In modern society, with the improvement of people's living standards and the increasing variety of outdoor activities, consumers have increasingly higher requirements for the functionality of textiles. Moisture-wicking and quick-drying properties have become one of the core performance indicators for clothing fabrics, especially sportswear, outdoor clothing, and underwear fabrics. These fabrics need to have the ability to quickly absorb sweat from the surface of the human skin and quickly conduct the sweat to the surface of the fabric for evaporation and dissipation, thereby keeping the human skin dry and comfortable and avoiding the sticky feeling, stuffiness, or even problems such as catching a cold and skin discomfort caused by sweat retention.

[0003] Nylon, a synthetic fiber widely used in the textile industry, boasts numerous advantages such as high strength, good abrasion resistance, excellent elasticity, and light weight, holding an important position in clothing, home textiles, and industrial textiles. However, the lack of hydrophilic groups in its molecular structure and its hydrophobic surface result in poor natural moisture absorption and quick-drying properties. Sweat easily forms droplets on the fabric surface, hindering rapid penetration and evaporation, severely impacting wearing comfort. This defect significantly limits the further application of nylon in high-performance clothing fabrics. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for preparing moisture-wicking and quick-drying nylon, which achieves rapid moisture absorption, efficient conduction, and rapid evaporation by forming a hydrophilic polymer network on modified nylon, thereby achieving the effect of moisture absorption and quick drying.

[0005] A method for preparing moisture-wicking and quick-drying nylon according to an embodiment of the present invention includes the following steps: preparing a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; preparing a polyethyleneimine solution with a concentration of 2-10 wt%; immersing raw nylon in the phosphorus pentachloride solution for activation reaction to obtain activated nylon; immersing the activated nylon in the polyethyleneimine solution for grafting reaction to obtain grafted nylon; and removing and drying the grafted nylon to obtain modified nylon.

[0006] The method for preparing moisture-absorbing and quick-drying nylon according to embodiments of the present invention has at least the following beneficial effects: the activation reaction of raw nylon with phosphorus pentachloride solution can convert the amide bonds on the surface and shallow layer of nylon fibers into acyl chloride groups, thereby improving the reactivity of the nylon surface; the grafting reaction of activated nylon with polyethyleneimine solution can stably bind PEI molecules to the nylon molecular chain through amide bonds, thereby constructing a continuous hydrophilic polymer network on the nylon surface, providing channels for moisture penetration and evaporation, thus achieving rapid moisture absorption, efficient conduction and rapid evaporation.

[0007] According to some embodiments of the present invention, the preparation of a phosphorus pentachloride solution with a concentration of 20-50 mmol / L includes the following steps: dissolving phosphorus pentachloride in n-hexane solvent to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L.

[0008] According to some embodiments of the present invention, the preparation of a polyethyleneimine solution with a concentration of 2-10 wt% includes the following steps: dissolving polyethyleneimine in deionized water to prepare a polyethyleneimine solution with a concentration of 2-10 wt%.

[0009] According to some embodiments of the present invention, the step of immersing the raw nylon in the phosphorus pentachloride solution for activation reaction to obtain activated nylon includes the following steps: immersing the raw nylon in the phosphorus pentachloride solution to allow the raw nylon and the phosphorus pentachloride solution to undergo an activation reaction for 5-60 minutes at a bath ratio of 1:30 to obtain activated nylon.

[0010] According to some embodiments of the present invention, the step of immersing activated nylon in the polyethyleneimine solution to carry out a grafting reaction to obtain grafted nylon includes the following steps: adding triethylamine solution, JFC penetrant and the activated nylon to the polyethyleneimine solution to carry out a grafting reaction between the activated nylon and the polyethyleneimine solution to obtain grafted nylon.

[0011] According to some embodiments of the present invention, the bath ratio of the activated nylon to the polyethyleneimine solution is 1:30.

[0012] According to some embodiments of the present invention, the concentration of the triethylamine solution is 0.5-2%, and the concentration of the JFC penetrant is 0.5-1.5 g / L.

[0013] According to some embodiments of the present invention, the temperature of the grafting reaction is 50-70°C, and the time of the grafting reaction is 12-18 min.

[0014] According to some embodiments of the present invention, the drying temperature is 45-55°C and the drying time is 23-26 hours.

[0015] According to some embodiments of the present invention, the method further includes the following step: removing surface residues of the grafted nylon using deionized water, wherein the number of water washes is 2-3 times, and the time for each water wash is 8-12 minutes.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 These are SEM characterization images according to embodiments of the present invention; Figure 2 This is a contact angle test diagram according to an embodiment of the present invention; Figure 3 This is a stress-strain curve diagram according to an embodiment of the present invention. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] In the description of this invention, the use of terms such as first, second, third, fourth, fifth, etc., is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "setup" and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] A method for preparing moisture-wicking and quick-drying nylon according to an embodiment of the present invention includes the following steps: Step S100: Prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; Step S200: Prepare a polyethyleneimine solution with a concentration of 2-10 wt%; Step S300: Immerse the raw nylon in the phosphorus pentachloride solution to carry out an activation reaction, and obtain activated nylon; Step S400: Immerse the activated nylon in the polyethyleneimine solution to carry out the grafting reaction, and obtain grafted nylon; Step S500: Take out the grafted nylon and dry it to obtain modified nylon.

[0023] Specifically, in step S100, the phosphorus pentachloride solution with a concentration of 20-50 mmol / L is a mild and efficient reaction concentration. This can avoid the situation where the local reaction is violent due to excessive concentration, resulting in dense accumulation of active sites and excessive cross-linking of grafting. It can also avoid the situation where the reaction is insufficient due to excessive concentration. This ensures that the active sites on the surface of the nylon fiber are evenly distributed, which provides a guarantee for the continuity and uniformity of the subsequent PEI graft layer and ultimately achieves consistent moisture absorption and quick drying performance.

[0024] In step S300, the activation reaction between the raw nylon and the phosphorus pentachloride solution is a key process for constructing active sites on the surface of the nylon fiber through chemical action. First, after the raw nylon is immersed in the phosphorus pentachloride solution, based on intermolecular forces, the phosphorus pentachloride solution... Molecules are rapidly adsorbed onto the surface of nylon fibers, and the solution can penetrate into the micropores and gaps inside the fibers, ensuring... It comes into full contact with the amide bonds on the fiber surface and in the shallow layer; then... The molecule attacks the carbonyl group (C=O) of the amide bond, forming an unstable intermediate complex. Then, the CO bond in the amide bond breaks, and the oxygen atom of the original amide bond is replaced by a chlorine atom, generating an acyl chloride group (-CO-Cl). After the reaction, the amide bonds on the surface and shallow layer of the nylon fiber are converted into acyl chloride groups (-CO-Cl). This group is a typical highly active functional group, which can improve the reactivity of the nylon surface. This is manifested in the fact that the chlorine atom is easily attacked by molecules containing amino groups (-NH2), undergoing a nucleophilic substitution reaction and forming a stable amide bond (-CO-NH-). It can be seen that the activation reaction process lays the foundation for the subsequent grafting reaction.

[0025] Furthermore, after step S300, the activated nylon can be removed, and the residual phosphorus pentachloride solution on the surface of the activated nylon can be removed using n-hexane solvent. Then, the activated nylon can be immersed in the polyethyleneimine solution for grafting reaction. In this way, the residual phosphorus pentachloride solution on the surface of the activated nylon can be removed using n-hexane solvent, thereby preventing the phosphorus pentachloride solution from having an adverse effect on the subsequent grafting reaction.

[0026] In step S200, since sufficient acyl chloride active sites have been generated on the nylon surface in step S300, the 2-10wt% polyethyleneimine solution can ensure that these active sites are fully utilized, avoiding the waste of grafting efficiency caused by excess active sites or insufficient PEI molecules, thereby achieving a stoichiometric balance between activation and grafting.

[0027] In step S400, the grafting reaction is essentially a nucleophilic substitution reaction between acyl chloride groups and amino groups, achieving the fixation of polyethyleneimine on the nylon surface through chemical bonding. The polyethyleneimine solution contains PEI molecules. The amino group (-NH2) on the PEI molecular chain has strong nucleophilicity and can attack the carbonyl carbon of the acyl chloride group, causing it to form an unstable tetrahedral intermediate complex. At this time, the C-Cl bond of the acyl chloride group gradually weakens due to changes in electron cloud density, thus causing the C-Cl bond to break. The chlorine atom, as a leaving group, detaches, and simultaneously, a H atom in the amino group combines with a chlorine atom to form an HCl byproduct. Next, the PEI molecule stably binds to the nylon molecular chain through a "-CO-NH-" amide bond, completing the grafting of a single PEI molecule. Because the PEI molecular chain contains a large number of amino groups, a single PEI molecule can bind to multiple acyl chloride groups, forming a cross-linked structure. This constructs a continuous hydrophilic polymer network on the nylon surface, providing channels for water penetration and evaporation.

[0028] In step S500, drying can accelerate the stabilization of amide bonds formed between acyl chloride groups and PEI amino groups on the nylon surface, reduce the residue of unreacted active sites, make the PEI hydrophilic layer more firmly bonded to the nylon surface, and improve the moisture absorption and fast drying function of the grafted layer.

[0029] The modified nylon, after the above-mentioned steps, achieves its moisture-wicking and quick-drying effect through rapid moisture absorption, efficient conduction, and rapid evaporation. Its core strength lies in the hydrophilic polymer network built on the fiber surface. Specifically, when moisture comes into contact with the surface of the modified nylon fibers, the hydrophilic polymer network quickly adsorbs the moisture onto the fiber surface. Through capillary action, the moisture rapidly penetrates into the micropores within the fibers and the gaps between fiber bundles. Then, it promotes the directional migration of moisture from the inner layer to the surface of the modified nylon. The water that migrates to the surface exists in the form of a water film, significantly increasing the contact area between the moisture and the air, thus providing conditions for rapid evaporation. Because the hydrophilic polymer network is evenly distributed, the moisture conduction process is free of localized stagnation, avoiding uneven moisture distribution and ensuring the overall moisture-wicking and quick-drying effect of the modified nylon.

[0030] In some specific embodiments of the present invention, the preparation of a phosphorus pentachloride solution with a concentration of 20-50 mmol / L includes the following steps: dissolving phosphorus pentachloride in n-hexane solvent to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L.

[0031] Specifically, n-hexane, as the activating solvent for phosphorus pentachloride, can rapidly dissolve solid phosphorus pentachloride, making... Uniformly dispersed in the system in molecular form, ensuring that each The molecules in n-hexane can fully contact the surface of nylon fibers, providing a material guarantee for the uniformity of the activation reaction. Furthermore, n-hexane does not chemically react with phosphorus pentachloride, generating no impurities and maintaining the chemical activity of phosphorus pentachloride, thus avoiding a decrease in activation efficiency due to solvent-solute reactions. Therefore, n-hexane can provide a stable and suitable reaction medium for the activation reaction, ensuring efficient dissolution of phosphorus pentachloride and a uniform and controllable activation reaction with the nylon fibers, avoiding interference from side reactions. In addition, n-hexane has a boiling point of approximately 69°C, making it easy to recover and purify, thus facilitating its recycling through vacuum distillation and reducing material waste.

[0032] In some specific embodiments of the present invention, the preparation of a polyethyleneimine solution with a concentration of 2-10 wt% includes the following steps: dissolving polyethyleneimine in deionized water to prepare a polyethyleneimine solution with a concentration of 2-10 wt%.

[0033] Specifically, deionized water contains no impurity ions and does not interact with the amino groups in PEI molecules. It can rapidly dissolve PEI and form a homogeneous and stable solution, ensuring that PEI molecules are dispersed in the system at the molecular level, avoiding aggregation. This is fundamental to the uniformity of subsequent grafting reactions and prevents problems such as excessive or insufficient grafting due to PEI aggregation. Furthermore, the absence of various ionic impurities in deionized water ensures that the PEI amino groups maintain high reactivity and react specifically with only acyl chloride groups, thus improving grafting efficiency.

[0034] In some specific embodiments of the present invention, the step of immersing the raw nylon in the phosphorus pentachloride solution for activation reaction to obtain activated nylon includes the following steps: immersing the raw nylon in the phosphorus pentachloride solution so that the raw nylon and the phosphorus pentachloride solution undergo an activation reaction at a bath ratio of 1:30 for 5-60 minutes to obtain activated nylon.

[0035] Specifically, in this embodiment, the bath ratio refers to the ratio between the mass of the original nylon and the volume of the phosphorus pentachloride solution. By setting the bath ratio to 1:30 and the activation time to 5-60 minutes, it is beneficial to allow the original nylon to undergo a full activation reaction in the phosphorus pentachloride solution, thereby improving the activation effect.

[0036] In some specific embodiments of the present invention, the step of immersing activated nylon in the polyethyleneimine solution to carry out a grafting reaction to obtain grafted nylon includes the following steps: adding triethylamine solution, JFC penetrant and activated nylon to the polyethyleneimine solution to carry out a grafting reaction between the activated nylon and the polyethyleneimine solution to obtain grafted nylon.

[0037] Specifically, during the grafting reaction, hydrogen chloride is generated. Triethylamine solution, as an alkaline catalyst, can neutralize the hydrogen chloride generated during the grafting reaction, thereby adjusting the pH value of the system and preventing the acidic environment from inhibiting the binding of active groups with amino groups in PEI molecules. This provides stable alkaline conditions for the grafting reaction, thereby effectively improving the grafting rate of PEI in nylon fibers.

[0038] Nylon fibers have a porous structure. Traditional grafting solutions, due to their high surface tension, struggle to penetrate the pores and inter-yarn spaces within the nylon fibers, limiting the grafting reaction to the fiber surface and restricting the modification effect to the outermost layer. JFC penetrant, however, possesses both hydrophilic and hydrophobic groups. By reducing interfacial resistance, it facilitates the rapid penetration of grafting solutions containing PEI and triethylamine into the fiber interior. This allows for full contact and reaction at the fiber surface, internal pores, and yarn interlacing points, achieving omnidirectional grafting. Consequently, it significantly reduces the surface tension of the grafting solution, promoting the diffusion and penetration of the reaction system into the nylon fiber interior.

[0039] In some specific embodiments of the present invention, the bath ratio of the activated nylon to the polyethyleneimine solution is 1:30.

[0040] Specifically, in this embodiment, the bath ratio refers to the ratio between the mass of activated nylon and the volume of the polyethyleneimine solution. By setting the bath ratio to 1:30, it is beneficial for the activated nylon to undergo a full grafting reaction in the polyethyleneimine solution, thereby improving the effect of the grafting reaction.

[0041] In some specific embodiments of the present invention, the concentration of the triethylamine solution is 0.5-2%, and the concentration of the JFC penetrant is 0.5-1.5 g / L.

[0042] Specifically, by setting the concentration of the triethylamine solution, it is possible to fully neutralize the hydrogen chloride generated during the grafting reaction, thereby effectively protecting the nylon fiber structure and preventing a decrease in its strength. By setting the concentration of the JFC penetrant, the polyethyleneimine solution is ensured to fully and uniformly penetrate into the nylon fiber, ensuring a uniform grafting reaction and improving functional uniformity.

[0043] In some specific embodiments of the present invention, the grafting reaction temperature is 50-70°C and the grafting reaction time is 12-18 min.

[0044] Specifically, a grafting temperature of 50-70℃ promotes the thermal motion of PEI molecules, enhancing their diffusion ability into the pores of nylon fibers. Combined with the action of JFC penetrant, this achieves omnidirectional grafting on both the surface and interior, avoiding uneven modification caused by insufficient PEI diffusion at low temperatures. A grafting time of 12-18 minutes is the optimal time for the grafting reaction to reach efficient saturation. This ensures that PEI molecules fully combine with the active sites on the nylon surface and inside, reaching the peak grafting rate. This avoids insufficient grafting rate due to too short a time, or excessive PEI accumulation on the fiber surface due to too long a time, causing pore blockage. This improves the grafting effect and significantly enhances the moisture absorption and quick-drying function.

[0045] In some specific embodiments of the present invention, the drying temperature is 45-55°C and the drying time is 23-26 hours.

[0046] Specifically, the stability of modified nylon can be improved by setting the drying temperature and time.

[0047] In some specific embodiments of the present invention, the following steps are also included: removing surface residues of the grafted nylon using deionized water, wherein the number of water washes is 2-3 times, and the time for each water wash is 8-12 minutes.

[0048] Specifically, deionized water can effectively remove ungrafted PEI and triethylamine hydrochloride solution residues from the neutralization reaction from the surface of grafted nylon. Furthermore, by adjusting the number of washes and the washing time, the washing effect of the grafted nylon can be improved, thereby ensuring that residual substances are removed.

[0049] Other components and operations of the method for preparing moisture-wicking and quick-drying nylon according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0050] The preparation method of moisture-wicking and quick-drying nylon according to an embodiment of the present invention is described in detail with reference to a specific example. It is worth understanding that the following description is merely illustrative and not a specific limitation of the invention.

[0051] A method for preparing moisture-wicking and quick-drying nylon includes the following steps: Step S100: Dissolve phosphorus pentachloride in n-hexane solvent to prepare a phosphorus pentachloride solution with a concentration of 25-35 mmol / L; Step S200: Dissolve polyethyleneimine in deionized water to prepare a polyethyleneimine solution with a concentration of 3-8 wt%. Step S300: Immerse the raw nylon in the phosphorus pentachloride solution to allow the raw nylon and the phosphorus pentachloride solution to undergo an activation reaction for 5-15 minutes at a bath ratio of 1:30, thereby obtaining activated nylon; Step S400: A 0.5-2% triethylamine solution, a 0.5-1.5 g / L JFC penetrant, and activated nylon are added to the polyethyleneimine solution to allow the activated nylon to undergo a grafting reaction with the polyethyleneimine solution, thereby obtaining grafted nylon; wherein the bath ratio of activated nylon to polyethyleneimine solution is 1:30, the grafting reaction temperature is 50-70℃, and the grafting reaction time is 12-18 min; Step S600: Remove residual substances from the surface of the grafted nylon using deionized water, wherein the number of water washes is 2-3 times, and the time for each water wash is 8-12 minutes; Step S500: Take out the grafted nylon and dry it at a drying temperature of 45-55℃ for 23-26 hours to obtain modified nylon.

[0052] According to the method for preparing moisture-absorbing and quick-drying nylon according to embodiments of the present invention, at least the following effects can be achieved by the activation effect of phosphorus pentachloride solution and the grafting effect of polyethyleneimine solution: a continuous hydrophilic polymer network can be constructed on the nylon, thereby enabling rapid moisture absorption, efficient conduction, and rapid evaporation, achieving an overall moisture-absorbing and quick-drying effect.

[0053] This invention verifies the effectiveness of a 5-factor or 4-factor orthogonal experimental design. The effects of modification process parameters such as concentration, activation time, PEI concentration, grafting time, and grafting temperature on the moisture absorption and quick-drying properties of nylon are shown in Table 1, and the experimental scheme and results are shown in Table 2.

[0054] Table 1: Factor Level Table

[0055] Table 2: Experimental Design and Results

[0056] According to the data in Table 2, when The optimal process parameters were obtained when the concentration was 30 mmol / L, the activation time was 10 min, the PEI concentration was 6 wt%, the grafting temperature was 60℃, and the grafting time was 45 min. These parameters were controlled within the range of steps S100 to S600. This reflects that the modified nylon obtained through the above steps achieved the best results in terms of drying rate, strength, drying rate membership, strength membership, and total score. Therefore, it can achieve excellent moisture absorption and fast drying function.

[0057] Furthermore, the untreated raw nylon, the activated nylon treated in steps S100 and S300, the modified nylon treated in steps S100-S600, and the raw and modified nylon after 150 standard washes were characterized by SEM, contact angle, strength, and moisture absorption and quick-drying tests. The results are as follows: SEM characterization: such as Figure 1 As shown, (a) represents raw nylon, (b) represents activated nylon, (c) represents modified nylon, and (d) represents modified nylon after washing. According to the SEM results, the surface of the raw nylon fiber is smooth and flat; after washing... After etching and activation, some etched holes appeared on the surface of the activated nylon. After PEI grafting modification, the holes on the surface of the modified nylon fibers basically disappeared, and particulate matter was attached to the surface. After 150 standard washes, the modified nylon fibers still retained most of the film structure, with no obvious peeling or detachment marks, only slight wear in some areas, reflecting the wash resistance stability of the grafted layer.

[0058] Contact Angle Test: The core function of the contact angle test is to quantitatively characterize the hydrophilicity and hydrophobicity of the sample surface. By observing the size and changes in the contact angle between a water droplet and the fabric surface, it directly reflects the improvement effect of the modification process on the hydrophilicity, stability, and wash resistance of nylon, providing crucial interfacial characteristic information for moisture absorption and quick-drying performance. The contact angle test results are listed below. Figure 2 In the figure, 0s represents the contact angle at 0 seconds, 20s represents the contact angle at 20 seconds, and the complete wetting time represents the minimum time required for the contact angle to be 0. The results show that the original nylon surface lacks hydrophilic groups, and water molecules are difficult to spread on its surface, existing only in the form of droplets. The initial contact angle is 127°, and complete wetting takes nearly 1 minute, indicating poor moisture absorption and quick drying performance. The modified nylon has significantly improved hydrophilicity, with an initial contact angle of 56° and a complete wetting time of 0.07 seconds, indicating that water can diffuse instantly and completely upon contact with the modified nylon surface, demonstrating excellent moisture absorption and quick drying performance. Moreover, after 150 standard washes, the modified nylon still maintains the best contact angle and complete wetting time, reflecting the wash resistance stability of the grafted layer.

[0059] Mechanical properties: Tensile test results are listed below. Figure 3 As shown in Table 3, the original nylon possesses excellent mechanical properties, with a tensile strength of 12 MPa. After etching and activation, the number of pores on the fiber surface increased, and the tensile strength of the sample decreased significantly to 6.9 MPa. However, after PEI grafting modification, the number of pores on the fiber surface decreased significantly, and the tensile strength increased to 8.4 MPa. After 150 standard washes, its tensile strength still remained at 9.7 MPa. It can be seen that although the tensile strength of the modified nylon is still lower than that of the original sample, the strength of 8.4 MPa fully meets the requirements for use in textile fabrics. Moreover, the breaking strength of the modified nylon after washing not only did not decrease, but actually increased slightly, and the tensile strain increased significantly. This indicates that the grafted structure has both functional and mechanical stability, and fully meets the durability requirements of repeated washing in actual wear.

[0060] Table 3: Mechanical Properties

[0061] Moisture-wicking and quick-drying performance: The results of moisture-wicking and quick-drying performance are shown in Table 4 below. The drying rate refers to the amount of water evaporated from the sample per unit time. The higher the value, the higher the perspiration efficiency and the better the quick-drying performance. The water droplet diffusion time refers to the time it takes for a small amount of water to spread completely on the fabric surface. The shorter the time, the stronger the wetting and diffusion ability of the fabric surface and the faster the moisture absorption response. The water absorption rate refers to the mass percentage of the sample after it is saturated with water. The higher the value, the stronger the fabric's ability to store water and the faster it can absorb sweat from the skin surface. The wicking height refers to the height to which water rises vertically along the fabric within 30 minutes. The higher the height, the stronger the capillary action of the fabric, which can quickly conduct surface sweat to the outer layer of the fabric and avoid sticking to the skin.

[0062] As shown in Table 4, the drying rate of modified nylon is significantly improved, increasing from 0.058 g / L to 0.28 g / L. Even after 150 washes, the modified nylon still maintains a high drying rate. In addition, the moisture absorption performance of modified nylon is also significantly improved. Specifically, the water diffusion time is reduced from 47.6 s to 1.5 s, the water absorption rate is increased from 279% to 292% compared to the original nylon, and the wicking height is increased from 41 mm to 182 mm. This indicates that the modified nylon has good moisture absorption speed and efficiency. Furthermore, the modified nylon still maintains good moisture absorption after washing.

[0063] According to the data in Table 5, the modified nylon was evaluated according to GB / T 21655.2-2023 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 2: Dynamic moisture transfer method", and its drying rate reached Level I. According to GB / T 21655.1-2023 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method", the modified nylon was evaluated according to GB / T 21655.1-2023 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method", and its drip diffusion time, water absorption rate and wicking height all reached Level III.

[0064] Table 4: Moisture Absorption and Quick-Drying Performance

[0065] Table 5: Evaluation of Moisture Absorption and Quick-Drying Performance

[0066] The test results above show that the modified nylon prepared by this invention has significantly improved efficiency in moisture absorption, diffusion, perspiration wicking, and quick drying, fully meeting the needs of sweaty scenarios such as sportswear, summer commuter wear, and underwear, and avoiding problems such as stickiness and stuffiness caused by sweat retention; moreover, the modified nylon has strong stability in function and structure, showing excellent washability, meeting the needs of repeated washing in actual wear.

[0067] In the description of this specification, references to terms such as "one embodiment," "some embodiments," or "this embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for preparing moisture-wicking and quick-drying nylon, characterized in that, Includes the following steps: Prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L; Prepare a polyethyleneimine solution with a concentration of 2-10 wt%; The raw nylon was immersed in the phosphorus pentachloride solution to carry out an activation reaction, resulting in activated nylon; The activated nylon was immersed in the polyethyleneimine solution to carry out a grafting reaction, thereby obtaining grafted nylon; The grafted nylon was removed and dried to obtain modified nylon.

2. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The preparation of a phosphorus pentachloride solution with a concentration of 20-50 mmol / L includes the following steps: dissolving phosphorus pentachloride in n-hexane solvent to prepare a phosphorus pentachloride solution with a concentration of 20-50 mmol / L.

3. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The preparation of a polyethyleneimine solution with a concentration of 2-10 wt% includes the following steps: dissolving polyethyleneimine in deionized water to prepare a polyethyleneimine solution with a concentration of 2-10 wt%.

4. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The process of immersing raw nylon in the phosphorus pentachloride solution to carry out an activation reaction to obtain activated nylon includes the following steps: immersing raw nylon in the phosphorus pentachloride solution to carry out an activation reaction between the raw nylon and the phosphorus pentachloride solution at a bath ratio of 1:30 for 5-60 minutes to obtain activated nylon.

5. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The step of immersing activated nylon in the polyethyleneimine solution to perform a grafting reaction to obtain grafted nylon includes the following steps: adding triethylamine solution, JFC penetrant and the activated nylon to the polyethyleneimine solution to allow the activated nylon to undergo a grafting reaction with the polyethyleneimine solution to obtain grafted nylon.

6. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The ratio of the activated nylon to the polyethyleneimine solution is 1:

30.

7. The method for preparing a moisture-wicking and quick-drying nylon according to claim 5, characterized in that: The concentration of the triethylamine solution is 0.5-2%, and the concentration of the JFC penetrant is 0.5-1.5 g / L.

8. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The grafting reaction is carried out at a temperature of 50-70°C for 12-18 minutes.

9. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: The drying temperature is 45-55℃, and the drying time is 23-26 hours.

10. The method for preparing a moisture-wicking and quick-drying nylon according to claim 1, characterized in that: It also includes the following steps: removing surface residues of the grafted nylon using deionized water, wherein the water is washed 2-3 times, and each wash lasts 8-12 minutes.

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